AF61r Efficiency Question
 

http://www.rxtuner.com/farticles/GoingSingle.pdf

It states that the maximum efficiency of 82% @ 18psi. Well, does this mean at 22psi the turbo will be at 100% efficiency?

Just curious, I plan on running 15 on street and 20-22 on track. Need some input!

Thanks
-Darren-

No. Maximum efficiency is...well...the maximum efficiency. Any boost above or below (or any airflow less or greater than) the max efficiency island will yield a decrease in efficiency. Have you ever studied any compressor maps before? There are some threads that will teach you how to read them, you can learn quite a bit from that.

-Marques

Never studied a compressor map, no clue how to read them =P

So you're saying, that 82% @ 18psi is the best possible setting for optimum performance. The turbo will be out its best at the psi? Therefore at 20psi, I might lose a certain percentage in efficiency? The same if I boost less...

It means its the best hp per psi , ( for example if your less psi say 12 psi your only making 5 hp per psi , then at 18 psi your making 8 hp per psi then after 18 say 19 -25 your making 7 per psi ).( this is a very primitive explaniation )

at 22 psi youll make more than at 18 , just that at 18 is were its efficiency is maximum.

I see what you're saying. The best HP to PSi ratio would be at that boost level. Makes sense. Thanks for clearing that up... I'll dig into compressor maps =P

u love the turbo at 12 psi, 15psi is awesome, ill wait for steve to come back before i go higher. please crank this thing up to twenty i would love to c what it does

as soon as i can get a map for 20 and race fuel, its going to the track

i should have my diff and axels by then =P

whats ur setup is it a 3rd gen or what, do u have the turbo on already

read my sig

shit sounds good guess i could of looked at it before. keep us posted whos tuning it

Its not only psi vs efficiency, you have to be flowing the right amount of air as well. 50 lbs/min at 18psi with 82% efficiency would be ballpark

http://www.turbocalculator.com/how-to-read.html

hehe

What on earth does it mean to compress air inefficiently? The less efficient the compression, the hotter the air. Compression Efficiency essentially tells what portion of the energy used is going to compression rather than heating up the air that's being compressed. The general rule of thumb is to keep efficiency above or near 65%, but this will obviously depend on the application.